CrystalSpace

Public API Reference

csplugincommon/rendermanager/rendergroupinghandler.h
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00001 /*
00002     Copyright (C) 2010 by Frank Richter
00003 
00004     This library is free software; you can redistribute it and/or
00005     modify it under the terms of the GNU Library General Public
00006     License as published by the Free Software Foundation; either
00007     version 2 of the License, or (at your option) any later version.
00008 
00009     This library is distributed in the hope that it will be useful,
00010     but WITHOUT ANY WARRANTY; without even the implied warranty of
00011     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012     Library General Public License for more details.
00013 
00014     You should have received a copy of the GNU Library General Public
00015     License along with this library; if not, write to the Free
00016     Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
00017 */
00018 
00019 #ifndef __CS_CSPLUGINCOMMON_RENDERMANAGER_RENDERGROUPINGHANDLER_H__
00020 #define __CS_CSPLUGINCOMMON_RENDERMANAGER_RENDERGROUPINGHANDLER_H__
00021 
00026 namespace CS
00027 {
00028   namespace RenderManager
00029   {
00030     template<typename RenderTree, typename ContextSetup>
00031     class RenderGroupingHandler
00032     {
00033     public:
00034       typedef typename RenderTree::ContextNode ContextNode;
00035 
00036       RenderGroupingHandler (iEngine* engine, RenderTree& renderTree, ContextSetup& contextSetup)
00037        : engine (engine), renderTree (renderTree), contextSetup (contextSetup) {}
00038 
00039       void operator() (ContextNode* context)
00040       {
00041         typename RenderTree::MeshNodeTreeType::Iterator meshNodeIter (
00042           context->meshNodes.GetIterator());
00043         int lastGrouping = -1;
00044         ContextNode* targetContext = nullptr;
00045 
00046         while (meshNodeIter.HasNext ())
00047         {
00048           typename RenderTree::TreeTraitsType::MeshNodeKeyType key;
00049           meshNodeIter.PeekNext (key);
00050 
00051           CS::RenderPriorityGrouping newGrouping = engine->GetRenderPriorityGrouping (
00052             CS::Graphics::RenderPriority (uint (key.priority)));
00053           if (lastGrouping == -1)
00054           {
00055             lastGrouping = newGrouping;
00056             context->renderGrouping = newGrouping;
00057           }
00058           else if (lastGrouping != newGrouping)
00059           {
00060             lastGrouping = newGrouping;
00061 
00062             // Set up last context
00063             if (targetContext)
00064               contextSetup (*targetContext);
00065 
00066             // Create new context to add coming mesh nodes to
00067             ContextNode* newContext =
00068               renderTree.CloneContext (targetContext ? targetContext : context);
00069             targetContext = newContext;
00070             targetContext->renderGrouping = newGrouping;
00071           }
00072 
00073           if (targetContext)
00074             context->MoveRenderMeshes (meshNodeIter, targetContext);
00075           else
00076             meshNodeIter.Next ();
00077         }
00078         // Set up last context
00079         if (targetContext)
00080           contextSetup (*targetContext);
00081       }
00082     protected:
00083       iEngine* engine;
00084       RenderTree& renderTree;
00085       ContextSetup& contextSetup;
00086     };
00087   } // namespace RenderManager
00088 } // namespace CS
00089 
00090 #endif // __CS_CSPLUGINCOMMON_RENDERMANAGER_RENDERGROUPINGHANDLER_H__

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